Refer to the exhibit. Router-WAN1 has a new connection via Gi0/0 to the ISP. Users running the web applications indicate that connectivity is unstable to the internet. What is causing the interface issue?
A.
Small frames less than 64 bytes are rejected due to size.
B.
The receive buffer is full due to a broadcast storm.
C.
Frames are discarded due to a half-duplex negotiation.
D.
Broadcast packets are rejected because ARP timeout is enabled.
Frames are discarded due to a half-duplex negotiation.. Cisco routing logic is deterministic: a router first matches the most specific destination prefix, then uses administrative distance when competing route sources advertise the same prefix, and finally evaluates the protocol metric when multiple paths remain inside the same routing protocol. First-hop redundancy protocols add a separate default-gateway resiliency function for hosts on a LAN. The other choices in this question either point to the wrong route-selection rule, confuse a protocol metric with administrative distance, or apply a Layer 2 concept where a Layer 3 forwarding decision is required. In production, that mistake would create blackholing, asymmetric routing, or a backup path that never activates. Cisco CCNA 200-301 v1.1 tests this because route selection is fundamental to troubleshooting reachability. The selected answer matches the behavior Cisco routers use when forwarding traffic or maintaining gateway redundancy.
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